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Mr Obama has said he is eager to make public what dealings his inner circle had with Governor Rod Blagojevich of Illinois, who faces federal allegations - which he denies - that he tried to sell Mr Obama's former Senate seat to the highest bidder.

Mr Obama has insisted that a preliminary internal investigation showed his staff did nothing wrong.

Apart from the report's release, Mr Obama plans to keep a low profile during his 12-day trip to Oahu.

Aides said the Obama family would have no formal events during the trip but will continue to have business meetings and intelligence briefings.